/Engine/Source/Editor/UnrealEd/Classes/Commandlets/AssetRegUtilCommandlet.h
Generate a new FOO which only takes partial update from new FOO files with input of an old FOO file and a new FOO file.
bool GeneratePartiallyUpdatedOrderFile ( const [FString](API\Runtime\Core\Containers\FString) & OldOrderFilePath, const [FString](API\Runtime\Core\Containers\FString) & NewOrderFilePath, const [FString](API\Runtime\Core\Containers\FString) & OutOrderFilePath, const float PatchSizePerfBalanceFactor )